The correct answer is D. ethanol.
Ethanol is a colorless, flammable liquid that is commonly used as a solvent, fuel, and antiseptic. It is also the main ingredient in alcoholic beverages. Ethanol is produced by the fermentation of sugars, such as those found in grapes, corn, or potatoes.
Tincture iodine is a solution of iodine in ethanol. It is used as an antiseptic and disinfectant. Cough syrup is a liquid that is used to treat coughs. It usually contains a combination of ingredients, such as dextromethorphan, guaifenesin, and menthol. Tonics are beverages that are claimed to have health benefits. They often contain herbs, spices, and other natural ingredients.
Methanol is a colorless, flammable liquid that is poisonous. It is used as a solvent and fuel. Ethanoic acid is a colorless, flammable liquid that is commonly known as acetic acid. It is used as a solvent, preservative, and flavoring agent. Acetic acid is also the main ingredient in vinegar.